ifModifiedSince property
read / write
The date and time specified by the ifModifiedSinceHeader header, if any.
Implementation
DateTime? ifModifiedSince;© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-io/HttpHeaders/ifModifiedSince.html